the output of fortran program gigantic (300gb) unformatted file. ( in fact, file includes time evolution of xyz coordinates of many many particles. so, data type real*8, if matters @ all) the problem not sure if of data written correctly, because of transient issue in computational server. now, im left gigantic file, , looking way check if of content healthy! is there way check weather of xyz's written correctly, , not corruptedly (say nan)? in addition dwwork's method of checking nans, can check infinity. after that, simple matter of reading file , looping through every value. since wrote file, assume can read it. program testinfnan implicit none real*8 :: x, y, z logical :: xnan, ynan, znan, xinf, yinf, zinf z = 1. x = z / 0. y = x / x print *, '' print *, 'x = ', x print *, 'y = ', y print *, 'z = ', z xnan = x /= x ynan = y /= y znan = z /= z print *, '' print *, 'xnan =...